GPIO: Add SPEAr GPIO driver

Tested on x600 (SPEAr600).

Signed-off-by: Stefan Roese <sr@denx.de>

diff --git a/arch/arm/include/asm/arch-spear/gpio.h b/arch/arm/include/asm/arch-spear/gpio.h
new file mode 100644 (file)
index 0000000..c3697de
--- /dev/null
+++ b/arch/arm/include/asm/arch-spear/gpio.h
@@ -0,0 +1,40 @@
+/*
+ * Copyright (C) 2012 Stefan Roese <sr@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+
+#ifndef __ASM_ARCH_SPEAR_GPIO_H
+#define __ASM_ARCH_SPEAR_GPIO_H
+
+enum gpio_direction {
+       GPIO_DIRECTION_IN,
+       GPIO_DIRECTION_OUT,
+};
+
+struct gpio_regs {
+       u32 gpiodata[0x100];    /* 0x000 ... 0x3fc */
+       u32 gpiodir;            /* 0x400 */
+};
+
+#define SPEAR_GPIO_COUNT               8
+#define DATA_REG_ADDR(gpio)            (1 << (gpio + 2))
+
+#endif /* __ASM_ARCH_SPEAR_GPIO_H */

diff --git a/drivers/gpio/Makefile b/drivers/gpio/Makefile
index 5ae68d5ba825d9c27a3a5f20646aa34824c68963..32a24749805cdf063eda08ebc04c8a4e59c59bcc 100644 (file)
--- a/drivers/gpio/Makefile
+++ b/drivers/gpio/Makefile
@@ -35,6 +35,7 @@ COBJS-$(CONFIG_PCA953X)               += pca953x.o
 COBJS-$(CONFIG_PCA9698)                += pca9698.o
 COBJS-$(CONFIG_S5P)            += s5p_gpio.o
 COBJS-$(CONFIG_SANDBOX_GPIO)   += sandbox.o
+COBJS-$(CONFIG_SPEAR_GPIO)     += spear_gpio.o
 COBJS-$(CONFIG_TEGRA_GPIO)     += tegra_gpio.o
 COBJS-$(CONFIG_DA8XX_GPIO)     += da8xx_gpio.o
 COBJS-$(CONFIG_ALTERA_PIO)     += altera_pio.o

diff --git a/drivers/gpio/spear_gpio.c b/drivers/gpio/spear_gpio.c
new file mode 100644 (file)
index 0000000..d3c728e
--- /dev/null
+++ b/drivers/gpio/spear_gpio.c
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2012 Stefan Roese <sr@denx.de>
+ *
+ * See file CREDITS for list of people who contributed to this
+ * project.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
+ * MA 02111-1307 USA
+ */
+
+/*
+ * Driver for SPEAr600 GPIO controller
+ */
+
+#include <common.h>
+#include <asm/arch/hardware.h>
+#include <asm/gpio.h>
+#include <asm/io.h>
+#include <errno.h>
+
+static int gpio_direction(unsigned gpio,
+                         enum gpio_direction direction)
+{
+       struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
+       u32 val;
+
+       val = readl(&regs->gpiodir);
+
+       if (direction == GPIO_DIRECTION_OUT)
+               val |= 1 << gpio;
+       else
+               val &= ~(1 << gpio);
+
+       writel(val, &regs->gpiodir);
+
+       return 0;
+}
+
+int gpio_set_value(unsigned gpio, int value)
+{
+       struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
+
+       writel(1 << gpio, &regs->gpiodata[DATA_REG_ADDR(gpio)]);
+
+       return 0;
+}
+
+int gpio_get_value(unsigned gpio)
+{
+       struct gpio_regs *regs = (struct gpio_regs *)CONFIG_GPIO_BASE;
+       u32 val;
+
+       val = readl(&regs->gpiodata[DATA_REG_ADDR(gpio)]);
+
+       return !!val;
+}
+
+int gpio_request(unsigned gpio, const char *label)
+{
+       if (gpio >= SPEAR_GPIO_COUNT)
+               return -EINVAL;
+
+       return 0;
+}
+
+int gpio_free(unsigned gpio)
+{
+       return 0;
+}
+
+void gpio_toggle_value(unsigned gpio)
+{
+       gpio_set_value(gpio, !gpio_get_value(gpio));
+}
+
+int gpio_direction_input(unsigned gpio)
+{
+       return gpio_direction(gpio, GPIO_DIRECTION_IN);
+}
+
+int gpio_direction_output(unsigned gpio, int value)
+{
+       int ret = gpio_direction(gpio, GPIO_DIRECTION_OUT);
+
+       if (ret < 0)
+               return ret;
+
+       gpio_set_value(gpio, value);
+       return 0;
+}